250,000 Twitter users have had their accounts hacked after the social networking site revealed its security had been breached.
Two officers at high-security prisons allegedly took illegal payments from journalists, a senior police officer has said.
Lord Justice Leveson has said he won't allow a full investigation into the Motorman files but it seems the files won't be shut for good.
The High Court has rejected Mirror Group Newspapers' attempt to throw out cases of alleged phone hacking involving Sven-Goran Eriksson, the Beckham's nanny and Garry Flitcroft.
Former Sunday Mirror editor Tina Weaver, who worked at the paper between 2001 and 2012, was arrested in a dawn raid as part of the Metropolitan Police's Operation Weeting inquiry into phone hacking in March.
Today the publisher of the Sunday Mirror, MGN Limited, has said it is being investigated for alleged phone hacking by ex-employees. Police are looking at whether it is criminally liable for alleged unlawful conduct
Ms Weaver, who was heavily pregnant at the time of her arrest, was held with former deputy editor of the newspaper Mark Thomas, current People editor James Scott and deputy editor Nick Buckley. All four were released on bail.
Trinity's Mirror's announcement comes after former Sunday Mirror and News of the World journalist Dan Evans was last week charged with phone-hacking offences.
He is accused of two counts of conspiring with others to intercept communications in their transmission, one of conspiracy to commit misconduct in public office and one of perverting the course of justice.
Trinity Mirror has released a statement following the announcement its subsidiary - MGN Limited - which publishes its national newspapers, is under investigation in relation to alleged phone hacking by its former employees. The investigation is said to be in its "early stages".
– Trinity Mirror spokesperson
The group does not accept wrongdoing within its business and takes these allegations seriously.
It is too soon to know how these matters will progress and further updates will be made if there are any significant developments.
The Sunday Mirror's publisher, MGN Limited, is under investigation in relation to alleged phone hacking by its former employees, the Metropolitan Police have said.
The Metropolitan Police had full access to all material relating to the Serious Organised Crime Agency's (Soca's) investigation into blagging of private details, which led to the jailing of four private investigators, the agency said.
A spokesman for the Met confirmed detectives received all of Soca's information from Operation Millipede between May and December 2011, but said:
This was essentially huge quantities of electronic data, the hard drives of which were supplied to the MPS.
This material was only put into list format for the Home Affairs Select Committee, and the MPS only provided with the information in that format on July 30.
The statement from the Met added:
In common with Soca, the MPS is not alleging that the individuals or companies on the list have, or even may have, committed a criminal offence.
The MPS is checking the list against its open investigations and will inform the committee when this is complete.
House of Commons Home Affairs Committee chairman Keith Vaz has said it is "very surprising" that the list of firms linked to rogue private investigators was not shared with the Met given the investigations into alleged hacking.
Detectives are carrying out inquiries codenamed Weeting, Elvedon and Tuleta into allegations of phone-hacking, illicit payments to public officials and computer-hacking by journalists, some linked to private investigators.
The Serious Organised Crime Agency (Soca) provided Mr Vaz's committee with the list - containing 102 firms and individuals, including blue chip companies, law firms and financial services groups - on condition that the names are not revealed.
But following the shock resignation of Soca chairman Sir Ian Andrews, Mr Vaz has said he will ask his successor to review the decision. He today said that Soca should act with "urgency", arguing that further delay would be unfair to those on the list who want the affair cleared up.
The Metropolitan Police has said it did not see a controversial list of 102 firms and individuals linked to rogue private investigators until last week.
The list was compiled by the Serious Organised Crime Agency (Soca), which is coming under pressure from MPs to publish the names of those found to have used investigators to obtain private information.
The Met confirmed it had access since 2011 to the information compiled by Soca that led to the jailing of four private investigators and was the basis for the agency's compiled list.
But a spokesman said police had not seen that list until last Tuesday, after it had been confidentially submitted to the House of Commons Home Affairs Committee.
The Home Secretary announces that private investigators will be regulated. They will now have to be licensed, including training and criminal checks. They could face prison and a fine if they operate without a licence.
Operating as an unlicensed private investigator is to become a criminal offence, Home Secretary Theresa May has announced.
Speaking at a news conference, Nick Clegg said he is very concerned about rogue private investigators. He told reporters, he will be publishing plans today to bring private investigators under the umbrella of regulations in place for the rest of the security industry.